mazurkas are very different from slip jigs, slip jigs are nine eight, mazurkas are three four, unlike waltzes they have an emphasis on the second or third beat.
Slip jig refers to both a style within Irish music, and the Irish dance to music in slip-jig time. The slip jig is in 9/8 time, traditionally with accents on 5 of the 9 beats — two pairs of crotchet/quaver (quarter note/eighth note) followed by a dotted crotchet note.